They should, my 71 Catalina came with a set of 1970 GTO D port ram air 3 manifolds on it (police car, came from the factory with them) I replaced them with Reproduction manifolds a few years ago due to the originals repeatedly cracking. They fit just fine.
I do not know if the F-Body or Round port versions would fit though.
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Jeff R
60 Jaguar Mark 2, 3.8L Automatic
67 Sprint Firebird 230 OHC-6 4-Speed A/C
78 Catlina Safari, Pontiac 400 powered
77 Astre Formula, 215 Buick V-8 T-5
73 Lemans Safari, 400 4bbl 4-speed
71 Catalina Enforcer, 455 4bbl
06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed!
2012 F-150 Echo Boost (My local Ford Dealer SUX!!!)
2020 Dodge Charger Scat pack (recovered)
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